ozone coupled mno 2 / al 2 o 3 Catalytic oxidation of so in flue gas 2 Method for preparing sulfuric acid

Abstract

The invention relates to the ozone low-temperature catalytic oxidation technology, and provides a method for producing sulfuric acid by catalytic oxidation of sulfur dioxide in flue gas via ozone coupling with manganese dioxide / aluminum oxide. The method includes cooling the flue gas passing through a selective catalytic reduction (SCR) reactor, injecting ozone, introducing the flue gas into a reaction tower with a desulfurizer, and performing oxidizing reaction to oxidize sulfur dioxide into sulfur trioxide, allowing the sulfur trioxide to enter into an absorption tower with the flue gas, and spray-washing the sulfur trioxide by 98.3% concentrated sulfuric acid to obtain the sulfuric acid product. The method of the invention performs catalytic oxidation of sulfur dioxide by using ozone coupling with manganese dioxide / aluminum oxide desulfurizers to produce sulfuric acid. The method of the invention has renovating significance in view of existing SCR coupling wet desulphurization devices; existing desulfurization towers can be transformed and integrated with the method, so as to achieve high-efficiency desulfurization denitration and effective sulfur resource recovery, save investment cost, and gain second income. The method of the invention can further treat organic matter and carbon monoxide while desulfurization.

Description

technical field [0001] The invention relates to the application of ozone low-temperature catalytic oxidation technology to the technical field of air pollution control, in particular to an ozone-coupled MnO 2 / Al 2 O 3 Catalytic Oxidation of SO in Coal-fired Boiler Flue Gas by Desulfurizer 2 Process for the preparation of sulfuric acid. Background technique [0002] In my country, various pollutants such as sulfur dioxide, nitrogen oxides, mercury, hydrogen chloride, volatile organic compounds, and dioxins produced by the combustion of fossil fuels such as coal and petroleum have become a major threat to environmental pollution. The country has also formulated strict thermal power industry emission standards (ie GB13223-2011), SO 2 Emission standard is 50mg / m 3 , NO x Emission standard is 100mg / m 3 , the emission standard of mercury and its compounds is 0.03mg / m 3 . [0003] The current desulfurization technologies for combustion systems can be divided into three ca...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the difficulties in the recovery of by-product gypsum in the current traditional wet desulfurization process, and the characteristics of easy blockage and scaling of the lye absorption device, and provide an ozone-coupled MnO 2 / Al 2 o 3 Catalytic Oxidation of SO in Coal-fired Boiler Flue Gas by Desulfurizer 2 Method for preparing sulfuric acid

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